Spring-motor mechanism



F. MAGIDSON.

SPRING MOTOR MECHANISM. APPLICATION FILED,0CT.16, 19I9- Patented June8,1920;

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F. MAGIDSON. SPRING MOTOR MECHANISM. APPLICATIO.N.'F|LED OCT. 16, 1.919.

Patented June 8, 1920 2 SHEETSSHEET 2- WITNESSES the energized springwith an escapement wheel and in permitting step by step rotation of thelatter to oscillate a pivoted arm or lever which may be connected to anyUNITED STATES PATENT OFFICE.

FRANK MAGIDSON, 0F UNIONTOWN, PENNSYLVANIA.

SPRING-MOTOR MECHANISM.

Specification of Letters Patent.

' Patented June 8, 1920.

Application filed October 16, 1919. Serial No. 331,138.

- To all whom it may concern:

Be it known that I, FRANK MAGIDSON, a citizen of the United States, anda resident of Uniont'own, in the county of Fayette and State ofPennsylvania, have made a new and useful Invention in Spring- MotorMechanisms, of which the following is a specification.

My invention relates to spring motors and consists in the "method ofconnecting suitable device. I have illustrated my invention as appliedto a dolls automatic cradle. The objects of my invention are to providea simple, efficient and economical assembly and mechanism for a springpower source and its escapement.

In the drawings Figure 1 is a longitudinal, vertical section and view ofsuch "a cradle as I have mentioned which is operated by my improvedmechanism; Fig. 2 is a section on line 22 of Fig. 1 showing theoscillating parts at one extreme of their movements; Fig. 3 is anenlarged section, similarly taken but'showing the parts at the otherextreme of their movements; Fig. 4 is a vertical, transverse sectionshowing the method of anchoring one end of the motor spring and Fig. 5is a section on line 55 of Fig. 4.

The cradle body 1 may be of any desired shape and construction and ateach end is swung from standards 2 and 3. These standards, with aconnecting member 4 comprise the cradle stand which houses and to whichis attached the spring motor mechanism which operates the cradle body.Member 4 consists of a sheet metal tube and at each end is secured topan shaped pieces 5 and 6 which provide an enlarged hearing for stands 2and 3 respectively and are secured to convenient lugs on the latter.

' Piece 6 houses the detent mechanism de- 12 in disk 11 is shaped toprevent relative rotation of the latter and core 7.

Alternate sectors of disk 10 are formed into lugs 14 and 15. The formerengage the pan 6 and the latter form a journal bearing for core 7. Disk11 is provided with lugs 16 which engage a ratchet wheel 17 mounted on ashaft 18 journaled in a boss 19 on standard 3.

One end of spring 8 is secured to core 7 and the other end is secured tolug let on disk 10 and is therefore immovably at tached to the cradlestand. Any energy in spring 8 will tend to rotate core 7, disk 11 andratchet 17 in the direction indicated by arrow A. This rotation ispermitted only intermittently by the escapement mechanism best shown inFigs. 2 and 3.

Pivoted on stand 3 by a shouldered screw 21 is an arm 22. The upper endof arm 22 is slotted at 23 to engage a projection 24 on the cradle body.Whenever the cradle is moved to one side it will tend to swing back likea pendulum and through projection 24 its movement will be transmitted toarm 22. Also pivoted at 21 is a ratchet pawl 25 which is adapted toengage ratchet wheel 17 and prevent rotation of same. Mounted on thelower end of arm 22 is a pawl 26 adapted to engage wheel 17 and to bemoved by same to the position shown in Fig. 3 or to be disengaged topermit arm 22 to be moved to the position shown in Fig. 2.

'Pawls 25 and 26 have opposing faces 27 and 28 respectively. These facesare preferably straight although they may be arcuate. Pivoted on arm 22are two small cams 29 and 30, one for each pawl. A spring 31 iscompressed between them and held in place by lugs on the cams. Arm 22may be recessed or slotted adjacent the spring to avoid contact withsame. These cams bear against faces 27 and 28 respectively and when arm22 is vertical the line of pressure through spring 31 and cams 29 and 30passes through the pivots of pawls 25 and 26 and does not affect thelatter. When arm 22 is moved to the position shown in Fig. 2 the line ofpressure is through the tail of each pawl which rotates the tooth ofpawl 25 into engagement with ratchet 17 and tends to rotate pawl 26 outof engagement with the wheel. When arm 22 is moved to the position shownin Fig. 3 the line of pressure is through the opposite portions of thepawls which tends to throw pawl 25 out of engagement and pawl 26 intoengagement with the ratchet wheel.

- When either pawl is engaged with ratchet wheel 17 and the latter ispressing against the pawl tooth, the pawl will be held against removal.Now if the arm 22 be moved so as tion and pawl faces 27 and 28horizontal, the

pawls are so shaped that both engage the ratchet wheel and spring 8 maybe wound up by crank 20. The cradle isthen moved manually toapproximately the point which brings the arm 22 to the position shown inFig. 2. Ratchet wheel 17 is held against rotation by pawl 25 and spring31 and cam rotate pawl 26 to the position indicated. The cradle isreleased and its pendulous swing; to the right, moving arm 22 with it,

will shift the line of pressure through spring 31 and cam 30 to theopposite side of the pivot of pawl 26and cause the tooth of the latterto engage the ratchet wheel near the I end of theswing. The momentumofthe' cradle and its load will move arm 22 and wheel 17 a shortdistance beyond thepoint 7 shown in Fig. 3 which permits release of thetooth of pawl 25allowing the latter to rotate'to the position shown inFig; 3 impelled thereto by the action of cam 29. All of the power ofspring 8 is now directed against the lower arm of lever 22 and tendstomove it back to the position shown in Fig. 2 when wheel17 will bestoppedby pawl 25 but the momentum of the oscillating parts will be.sufficient to reverse the rotationofwheel 17 against spring 8 enough torelieve the pres sure on pawl 26 and permit same to assume. itsdisengaged position. This cycle of movements is repeated as longas themotor spring retains energy. If at any time the mechanism be stoppedmidway of an oscillation, theinertia of the cradle and load will holdthe mechanism quiescent until manually started again.,

The advantages of my device lie in its simplicity, few parts and ease ofassembly. Its efliciency is largely obtained by the mountmg of most ofthe pawl reversing parts onv theoperated lever or arm 22. This arm andthe parts mostdiflicult to handle may be assembled and inserted in thecom-. pleted cradle as a unit- The motion of-the oscillating arm about apivotalpoint spaced from the center of the ratchet wheel is a novelfeature which enables the pawl reversing parts to-function as they do.This reversing means is unusually quiet for an escapement mechanism andits simplicity will be demonstrated by'a comparison with former patentsissued to me n similar mechanisms, namely, Nos. 1,212,786; 1,212,787 and1,212,789 and with that mechanism shown in 'a'copending application ofmine, Serial No.

291,247. The economy in cost of manufacturing is apparent.

1. An escapement mechanism for a spring impelled ratchet wheel,comprising a pair of pivoted ratchet pawls having opposed surfaces, apivoted arm upon which one of said pawls is mounted and pawl reversingmeans mounted on. said arm and bearing against said surfaces andadapted. to shift to opposite sides ofthepiv'ots of said pawls as saidarm is oscillated. 1

2. In a spring motor mechanism, a spring impelled ratchet wheel, apivoted, oscillating arm, a pair of ratchet pawls, a pivoted cam foreach of said pawls,jeach of said cams being adapted to engage itsrespective pawl with said wheelduring alternate oscillationsof said armand to disengage same at the end of the, intermediate oscillations.

3. An escapement mechanism for a spring motor comprising a springimpelled ratchet wheel, a pivoted, oscillating arm, a ratchet pawlmounted upon an immovable pivot, a ratchet pawl pivoted upon said arm,pivoted cams adapted to'bear against said pawls and to engage anddisengage them alter nately with said wheelduring successiveoscillations ofsaid arm. r

r 4. In aspring motor mechanism, a coiledspring,-a ratchet wheelimpelled thereby, a pawl-mounted upon afixedpivot, a lever pivoted at apoint spaced from'the; center of;

said wheel, a pawl mounted upon said lever,

pivoted cams bearing against said pawls and adapted to alternatelyengage and disengage said pawls .withsaid' wheel: as saidlever .isoscillated by alternate forces, namely, the energy in said spring andthe gravityp'ull resulting from the application of said energy to saidlever.

5. In anescapement mechanism, a spring impelled ratchet wheel, a leverpivoted outside the periphery of said wheel and pro vided with an armextendingftoward the center of said wheel, a ratchet pawl pivoteduponsaid arm, a ratchet pawlpivoted upon a fixed pivot, each of said pawlshaving a tooth adjacent the'teeth of said wheel, and

respective cams bearing against the sides of said pawls, each camadapted to rotate its respective pawl intoor out of engagement with saidwheel according to the side of thepawl pivot on which itbears,said camsbe- 7 ing so mounted that oscillation of said lever shifts the bearingpoint of each" cam from one sideto the other ofthe pivot ofitsrespective pawl- V a 6. In aspring motor, a spring impelled ratchetwheel and. an escapement mechanism for same comprising .an gscillatingarm, pawls "and-pawl reversing means, said means being mounted on saidarm and said -mechanism being assembled as a unit with said wheel. 7

7. In an escapement mechanism for .a spring impelled ratchet wheel, anoscillating arm pivoted at a point spaced from the center of said wheelso that one end of said arm moves in an are which intersects theperiphery of said wheel when said arm is oscillated, a ratchet engagingpawl mounted on a fixed pivot, a ratchet engaging pawl pivoted on saidarm end and means adapted to reverse said pawls at each end of thearcuate movement of said arm end.

8. In a spring motor mechanism, a core,

an element provided with lugs which form a bearing for said core andprovided with other lugs which engage a frame on which the mechanism ismounted and also engage one end of a spring which is coiled about saidcore and has its opposite end secured to said core, a ratchet wheel anda ratchet wheel engaging member non-rotatably secured to said core bymeans extending through said element.

In testimony whereof, I have hereunto subscribed my hand this 13th dayof October, 1919.

FRANK MAGIDSON.

